Method of preventing offset.



lll

l lilllht GEQRGE G. MURRJY, F LARCHMONT, NEW' YORK.

Specification of Lette 's Patent Patented den.. 2i, MMS

@riginal application ledfanuary 27, ISGS, Serial No. 296,190. i livired and this application filed April 11` .To all 'telefoni 'it 'muy eem/ern lie it known that l', Geenen G; MURRAY, n eitieen et? the United @tete/s, and e resident of Lerehmont, eonnty oi? liestehester, und Siete of lilies? "lorie, have invented certain new und useful improvements in Methods l`-feventingi tlset, oi which the tollou inn; is speeilieetion,

i jinvention reletes to s method for the L invention of oil'set in printing presses and other nieebenieins for manipulating; printed lnsterinl, the ne being particularly useiul ne eurried out in connection With presses for printing?, on both sides of paper or similar materiel. iin presses of this character und in various mechanisms for manipulating printed material and especially fresh printed Stor exemple, delivery mechanisms of printing and folding mechenisins, it' the inl; bearing; surface oi the printed materiel comes in contact-"With any pertot the mechanism some ot' the ink may be transferred to such part, especially Where there is any pressure exerted bet-Ween the contesting; eurueesg zuid einer e certain ernennt of ink hss been thus transferred, it begins to set oli' or oi'set, it is termed, onto the kpassing insteriul.- Greet diltcultv hesbeen veinmerieneed in preventing this oileet, especially in the liner classes et printing, essere not only is the offset more apt to oceur by reason of the nature of the materiels used but even o slight amount of det'ieement due to oitset constitutes limestserious def- .Although much attention has been d to this matter by those skilled in `the 4v, no solution of the problem has been -iied which is generally applicable, end ulsrly which will permit oit the liner es of printing; being; performed onperpresses, and pertioulurly on rotary perfeeting presses Where the impressions on he opposite sides of the' peper ere etected in substantially instuntuneous succession, end Where the printed product oennot be manipulated, es in ,folding or delivering, Without contact with thefresh printed surfeces.

My invention has ior en object to 'provide e method whereby the det'zieement of printed metter by offset may be etleetively prevented, and more particularly to provide s method whereby otsetting may be Serial No, 426,49.

`other mechanisms for manipulating printed materiel, whereby the complicated and estpensive mechanisms now 'commonly used for this pur iose may be dispensed with.

These and other objects oit the invention "will in part be obvious and in part be pointedout in the following description.

l he. ve found that s transfer o1c ink from n, printed surface to :L surfe-ce With which it comes in Contact will not take place, to e harmful extent et leest, in the presence of n stable emulsion, even where the surfaces are brought into Contact under heavy pressure, suoli, for exemple, as exists between en impression surface and the materiel being printed thereon. To obtain goed results the surface of the member to which the emulsion is applied is preferably slightly rouglr ened or grained or mede to a Certain extent porous so that it will more readily carry u suitable quantity or supply of the emulsion, In the case of an impression member of e printing press, moreover, the surface should be yieldingr or flexible or of such s 11e-ture that it will properly support the' peper or other material to be printed in Contact with the design member; und where the usuel packing is employed on the impression member, the emuleien-carrying .member should' be impervious to the emulsion so :is to prevent the destruction or impairment nl" the peeking materials.

I have found an emulsion or amin'tnre or" oil ind- Water or similar substances in the nature oi' :in emulsion, and `particularly :in emulsion or similar compound of boiled linseed oil, or linseed oil of like character, andv Water, to lgive good results when used in oonneotion with the impression member of a printing; press, the proportions employed being one part of oil to three parts of Water with a little caustic. soda ,to facilitate and render stable the emulsification of the oil in the water. Where boiled linseed oil is ernployed, it is preferably used in e substantially pure condition; the oxidizing agents 5@ diagramma vdo-nal View on an y a `5mm! m' se deeui @ne Q12 he' impression 'man 25' bers of the pess.

prin ng median commnni commerce se.

More uiy in y A invention, haveil'us'ae in iii-e drawing, which is eiered to herein and forms a part hei-eraf, a masking by Wi my methec' mfiylb carnts eec and which machine will be herein desfzriierl in cminecion with th me'ho in order that 'the ai may be more uiy and .iigectiveiy s '1 oz'i.

Uf "che dmwinb., Figure l. is ii View partly Hy secinal ilimfor Camry'- ,.15 @mi Fi@ secsca tra-*Ling :i piin't mg out my im Reei-ng 1:0 the lw detaii,.the pfes fheie shown im impression Cyiinder l aromi" .vhi ii wie miange a series of 1P-gil @finden adapted to print a, seies 0 lmp? 3115 on 'one side the paper. s shown., this prfss inten-ded to print upm pap@ 01 Gimiiai iziateria in web 'on'i, il@ web being' cmi'tinuousy Supplied from mii ipnssing around e cyinfci cei L* sevei'al impressins from the c3 infieifs, the web passers between fue )iessionv and esigu members ft 5, .ctivelgg a. second bv ii: recfives im.-

side. fier n* rfmcimism, the mechanism, .conveying s 1.12pm time m n s fiied side 0 impzesson iater is sup This may be ac- Wav. In

membei *.hf: surface m.

ne emulsion com; Si in may s; 'paricuim c ousmaium shown there is plcre @rv-.fer 'h usf i packing 8 of the cyiml der sheet "n ubei- 9 of material which is impervious 'no i ie exnsifm and which is at the same time providef with a. suitabe porous m* gi'uued surface adapt-ing it to @any a Suit. bie. quantity f' supply of the emusion wihm iinmiiiy 3f transferring the s'me to n bfi-rm ii exent to the surface of tine paper or n'mierm being printed. Pref enhy this Myer H1- il'embv'v Shoui )e To prevent Asurface which is suiaby porous or i and at the saigne ime me 5. -V is ble in and 11n-emma@ 30 boled iinseed mi a'id Wma? ilpiression surface. iqiid fistributingm.,

fountain M, a.;

conveying o? uw Y Teiler @5 my he caniafl mit in Coi. mii "Y iviai surfaces whiff@ cmu-e in ,1r manipuiaie H13 'pi' mi 'Aowg for erfampia, 'die iin smve Mb Hei theieon. it a 'be u? l that in this am cuion il @u mi ciau" Sion 01 @il mici hai' im ink Deming surface mm in m12 3. The :met-bod 03'? @www-ung @i weies ehinerji," for manipulating' printed materiel, which method consists in applying' an emulsion of hoiied liriseed'oii and Waiter to e surface with which an ink bearing surface comes in Contact.

Li. The method of preventing offset in printing presses, which method consists in applying" a stebleemuision to a perfecting impression surfaceof the press.

5. The method of preventing offset in printing: presses7 which method consists in eppiyinp; an emulsion of boiled iinseed oil and water be e perfecting impression surface of the press.

6. The method of prevent-ing' ofiset of ink from printed paper to the impressionsub ieee of n printingpress, which method consists in keeping said impression sur-face moistened with a stable emulsion suiiicientiy' to repel the ink from said impression# snrface and thereby prevent the soiling of said surface.

7, The method of preventing oiiset in machinery for manipulating printed materiai,

. which method consists in mixing oil, Water,

and en alkaline substance to form a stable en'mision, and then applying said emusion to e suri'see with which an iniehearingn sur fece comes in Contact.

8. The method of printing', which method consists in mixing' oii and Water and en 211km iine substance to form e, stable emulsion, applying said emulsion to :1n impression surface, placing printed peper on said impression surface with a printed side in Contact therewith, end then printing; on the opposite side of said paper. l

9. The method of preventing offset in {villini-ing' presses, which method consists in mixing hoiied iinseed oil, water, and caustic sode to form e stable emulsion, providing in the press an impression surface which. is impervious to the smid emulsion and keepinnseid impression surface moistened with seid Aemulsion suiiiciently to repel the iniI therefrom, suhsta-ntiniiy as and for the pnrpose sei; forth I 1G. The method oi p1'inting,which method consists in applying s stable emulsion to an impression suriaee, placing' printed peper on said impression surface with e printed side in Contact there-With, and then printing on the opposite side of said paper.

11. rifhe method oi printing, which method consists in providing' an impression surface which is impervious io an emnisionoi oii and Water, moistening seid impression surface With said emuision sniiicientiy to repei ink therefrom.3 pisciner printed peper on seid impression surface with a print-ed side in Contact therewith, and printing on the opposite side of seidl peper.

in testimony-whereof, have signed my nome to this specification, in the presence of two subscribing; Witnesses.

v G. MU BRAY.

Wfi'tnesses z 

